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64
Field hook-up
Figure 4-4 illustrates one method of connecting the 475 Field
Communicator to a fieldbus segment. The 475 Field Communicator
can be connected at any convenient place along the bus (segment). In
the field, this is typically done at the device or at the fieldbus junction
box.
Figure 4-4. Field wiring diagram example
Fieldbus
Fieldbus
power
host
+
control
conditioner
system
-
+
24 VDC
power
supply
CAUTION
The 475 Field Communicator draws approximately 12 mA from the
fieldbus segment. Ensure the power supply or barrier on the fieldbus
segment has the capacity to provide this additional current. If a
fieldbus segment is drawing near the capacity of the segment's power
supply, connecting the 475 Field Communicator may result in loss of
communication.
Fieldbus
T
junction
e
+
+
box
r
m
-
-
i
n
-
a
t
o
r
Fieldbus functionality
T
e
+
r
m
-
i
n
a
t
o
r
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